Centaurs and trans-Neptunian Objects (TNOs)
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Jupiter Trojans are not located beyond Jupiter. Rather, they share its orbit and travel as a cloud around the Lagrange points 60° ahead (L4) or 60° behind (L5) the planet around the Sun. Though we know meanwhile of Neptune, Mars and even Earth Trojans, I refer in this article only to Jupiter Trojans. Even if they are not located beyond Jupiter, they are interesting primitive bodies. Most Trojans are D-type, but we find also P-types as well as C-type (which are common in the main belt) among the Trojans [8]. It is not clear whether they formed at or near their present location or whether they have formed in outer regions and then have been captured into their current orbits during the early stages of the solar system’s formation or slightly later, during the migration of the giant planets (Nice model [9]). If they are captured from outer regions, they could serve (similar to Centaurs) as easier-to-study proxies for primitive bodies / TNOs (in fact a space mission is soon to be launched to study the Trojans). Despite we yet have no good population distribution model, its is predicted, that the Rubin Observatory / LSST will discover almost 300,000 Jovian Trojans. The largest three members are (624) Hektor (diameter ~225 km), (617) Patroclus (diameter ~140 km) 2 and (911) Agamemnon (diameter ~130 km). 

 

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